Having the same issue on a fresh install. "Lock unreleased platform_start".
Installing my first up got stuck with "Starting services..."
I see that there is an update (hoping this brings a fix), but I can't update because the system is waiting to complete the app installation which, in turn, seems to be waiting for something else to happen.
Unfortunately, I also can't stop the installation or uninstall.
So it seems I am completely stuck 